If the update fails and you see this image, you'll be unable to use the tracker until the error condition is resolved:

In this case tap a screen or press a button to return to the clock and try the update again. (If you see "fitbit.com/setup" follow the instructions in How do I set up my tracker?) If the update doesn't work, restart your tracker and try again.

Low Battery or Low/High Temperature

If you see the critically low battery screen when attempting a firmware update, charge your Blaze and try the update again.

Likewise if you see a temperature screen, try the firmware update again when Blaze has cooled off or warmed up.

Unlike Step 1 when you rebooted your tracker, a factory reset actually deletes your settings and recent data. It also requires setting up the tracker again after the reset. For these reasons its the troubleshoot of last resort but only take a few minutes.

Before you begin the firmware update, make sure your watch is plugged into the charger and in range of your Wi-Fi network during the update. For best results, use your home or work Wi-Fi network. If you've never connected your watch to Wi-Fi, see How do I connect my Fitbit watch to Wi-Fi?

If the firmware update failed, you may see this image on your watch's screen:

Follow the troubleshooting steps below based on your issue to resolve the problem.

Low Battery

If your watch isn't sufficiently charged before starting the update, you may see this image on your screen:

Wait until the battery is at least 40% charged to start the update and keep your watch plugged into the charger. To check the battery level, tap the screen or press any button while the watch is charging.

Update Failed over Wi-Fi

If you have trouble updating your watch over Wi-Fi, try these steps to resolve the problem:

Step 2

Step 3

Check to see if you have another Fitbit tracker or watch paired to your phone. If so, you must tell your phone to "forget" the device, removing the connection between the phone and the Fitbit device.

On your phone, go to Settings > Bluetooth > find the tracker or other watch in the list > find an option to forget the device.

Try again to update your watch.

If you can't update your watch over Wi-Fi, follow the on-screen instructions in the Fitbit app to update your watch over Bluetooth instead. Note that firmware updates over Bluetooth may take significantly longer to complete.

Update Failed over Bluetooth

If you have trouble updating your watch over Bluetooth, try these steps to resolve the problem:

Step 1

Try turning Bluetooth on and off on your phone.

Restart your watch by holding the back (left) and bottom buttons until you see the Fitbit logo.